Dataset S4. Standard and routine respiration rates in aquatic invertebrates Notes to Table S4: Group (as shown in Table 1 in the paper): I – copepods & krill (also includes seven branchiopods and two Balanus spp.), Crustacea; II – peracarids (amphipods, isopods, mysids, two cumaceans, as well as five (non-peracarid) ostracod species), Crustacea; III – decapods, Crustacea; IV – cephalopods, Mollusca; V – gelatinous invertebrates: chaetognaths and medusae. Higher taxon, Family: taxonomic status, including family, was determined from various sources, including PubMed Taxonomy; World of Copepods (Smithonian National Museum of Natural History), Integrated Taxonomic Information System (www.itis.gov) and metabolic data sources. Table S4 should NOT, however, be used as an authoritative reference for detailed invertebrate taxonomy. MIN: for each species, indicates the minimum value of mass-specific metabolic rate corresponding to 25 °C. Data from rows marked “MIN” were used in the analyses shown in Table 1 and Figures 1-3 in the paper (a total of 376 values for 376 species). −1 qWkg is standard or routine respiration rate converted to W (kg WM) (Watts per kg wet mass) using the energy conversion factor of 1 ml O2 = 20 J. For crustaceans, the basis for this data set was formed by the data base of Alekseeva (2001) deposited at Koltzov Institute of Developmental Biology, Moscow, Russia and kindly provided to the authors by T.A. Alekseeva. This database contained 200 species, to which about one hundred species was added by the present authors by literature search. Usually, in metabolic studies animals were kept in filtered water for 12-24 hours or until their guts were empty. However, for some species, especially small marine ones (Ikeda & Skjoldal 1982) it was not possible to ensure that stomachs were empty. Where possible, respiration rates were measured on calm inactive animals. For each species, the minimum reported value was always used. To get an idea of how the reported metabolic rates are elevated above the "true" standard meatbolic rate (sensu, e.g., Steffensen 2002), see SI Methods. Taking into account that in copepods the dry mass to wet mass ratio is somewhat less than the crude mean of 0.3 applied throughout the analysis (see SI Methods, Table S12a) (copepod DM/WM is about 0.17-0.20, see column WC below), even if "true" standard metabolic rate is approximately twice less than the measured group mean, while DM/WM ratio is about 1.5-2 times lower than 0.3, this means that if correction is made for the lower DM/WM content in copepods, our value of 3 W kg−1 is comparable to the other group means in the database. In gelatinous species (group V) (medusae and chaetognaths) with DM/WM ratio significantly smaller (by 7 and 3 times, respectively (Ikeda & Skjoldal 1989; Hirst & Lucas 1998)) than the crude mean DM/WM = 0.3 for the non-gelatinous groups, wet-mass based metabolic rates were multiplied by a factor of 7 and 3, respectively, to be comparable with the rest of the data base analysed assuming DM/WM = 0.3. For these species qWkg stands for the actual value multiplied by the corresponding factor (7 or 3). In cephalopods, minimum mass-specific metabolic rates for each of the 38 species studied by Seibel (2007) were included into the analysis. The data base of Seibel (2007) contains 218 values for 38 species, of which only minimum values for each species are reported here, those used for the analysis. TC is ambient temperature during measurements, degrees Celsius. (25 − TC)/10 −1 q25Wkg is metabolic rate converted to 25 °C using Q10 = 2, q25Wkg = qWkg × 2 , dimension W (kg WM) . For each species rows are arranged in the order of increasing q25Wkg. Mg is wet body mass in grams; DMg is dry body mass in grams; N/DM is the nitrogen to dry mass ratio, where available; WC is water content in wet mass, %: WC = (1 - DM/WM)×100, values with questions (e.g., ?80) indicate that qWkg was obtained from dry-mass based measurements using an assumed WC determined from a different source than the source of metabolic data for that species. Group Higher Taxon Family Species MIN q25Wkg qWkg Mg TC DMg N/DM WC Source I1. Copepoda Acartiidae Acartia clausi MIN 5.2520 2.626 0.0000275 15 0.0000055 80 Nival et al. 1972 I2. Copepoda Acartiidae Acartia clausi 7.5 2.0 0.000025 5.9 0.0000049 ?80 Conover 1960 I3. Copepoda Acartiidae Acartia clausi 8.3145 4.1 0.0000425 14.8 0.0000085 ?80 Ikeda et al. 2001 I4. Copepoda Acartiidae Acartia clausi 13.6 3.4 0.000021 5 0.0000041 ?80 Conover 1960 I5. Copepoda Acartiidae Acartia clausi 14.4 3.6 0.000024 5 0.0000047 ?80 Conover 1960 I6. Copepoda Acartiidae Acartia clausi 15.8 4.2 0.000022 5.9 0.0000044 ?80 Conover 1960 I7. Copepoda Acartiidae Acartia clausi 16.3 4.25 0.000037 5.6 0.0000073 ?80 Conover 1960 I8. Copepoda Acartiidae Acartia clausi 17.6 4.4 0.000036 5 0.0000072 ?80 Conover 1960 I9. Copepoda Acartiidae Acartia latisetosa MIN 11.7 8.3 0.0000297 20 Pavlova 1961 I 10. Copepoda Acartiidae Acartia longiremis MIN 11.1665 3.84 0.0000405 9.6 0.0000081 ?80 Ikeda et al. 2001 I 11. Copepoda Acartiidae Acartia pacifica MIN 6.1580 6.6 0.000039 26 0.0000078 ?80 Ikeda et al. 2001 I 12. Copepoda Acartiidae Acartia tonsa MIN 10.9572 8.9 0.000035 22 0.000007 ?80 Ikeda et al. 2001 I 13. Copepoda Arietellidae Arietellus cf. plumifer MIN 0.880 0.220 0.0095 5 Thuesen et al. 1998 I 14. Copepoda Megacalanidae Bathycalanus bradyi MIN 0.5788 0.135 0.0299 4 0.0084 0.069 72 Childress 1975 I 15. Copepoda Megacalanidae Bathycalanus bradyi 0.816 0.204 0.0555 5 Thuesen et al. 1998 I 16. Copepoda Megacalanidae Bathycalanus bradyi 1.5862 0.370 0.0299 4 0.0084 0.069 72 Childress 1975 I 17. Copepoda Megacalanidae Bathycalanus bradyi 0.736 0.184 0.0756 5 Thuesen et al. 1998 I 18. Copepoda Megacalanidae Bathycalanus bradyi 1.071 0.210 0.0530 1.5 Thuesen et al. 1998 I 19. Copepoda Megacalanidae Bathycalanus princeps MIN 0.2280 0.059 0.0355 5.5 0.0070 0.096 80.2 Childress 1975 I 20. Copepoda Megacalanidae Bathycalanus princeps 1.2634 0.327 0.0355 5.5 0.0070 0.096 80.2 Childress 1975 I 21. Copepoda Megacalanidae Bathycalanus richard MIN 0.732 0.183 0.0380 5 Thuesen et al. 1998 I 22. Copepoda Megacalanidae Bathycalanus richardi 0.532 0.133 0.0560 5 Thuesen et al. 1998 I 23. Copepoda Megacalanidae Bathycalanus richardi 1.193 0.234 0.0377 1.5 Thuesen et al. 1998 I 24. Copepoda Megacalanidae Bathycalanus sp. MIN 1.67 0.42 0.0895 5.1 0.0179 ?80 Conover 1960 I 25. Copepoda Megacalanidae Bathycalanus sp. A MIN 0.816 0.204 0.0572 5 Thuesen et al. 1998 I 26. Copepoda Calanidae Calanoides acutus MIN 0.9108 0.161 0.003329 0 0.00079 76.3 Kawall et al. 2001 I 27. Copepoda Calanidae Calanoides acutus 3.3841 0.59 0.002 -0.2 0.000394 ?80 Ikeda et al. 2001 I 28. Copepoda Calanidae Calanoides acutus 3.8652 0.66 0.0011 -0.5 0.000218 ?80 Ikeda et al. 2001 I 29. Copepoda Pontellidae Calanopia elliptica MIN 4.7079 5.56 0.00028 27.4 0.000056 ?80 Ikeda et al. 2001 I 30. Copepoda Calanidae Calanus cristatus MIN 2.8473 1.094 0.00862 11.2 0.00169 Ikeda 1971 I 31. Copepoda Calanidae Calanus cristatus 2.9639 1.100 0.00908 10.7 0.00178 Ikeda 1971 I 32. Copepoda Calanidae Calanus cristatus 3.1012 1.167 0.00704 10.9 0.00138 Ikeda 1971 I 33. Copepoda Calanidae Calanus cristatus 6.0946 1.850 0.00918 7.8 0.0018 Ikeda 1971 I 34. Copepoda Calanidae Calanus cristatus 7.0211 2.161 0.00755 8 0.00148 Ikeda 1971 I 35. Copepoda Calanidae Calanus cristatus 7.4097 2.394 0.0076 8.7 0.00149 Ikeda 1971 I 36. Copepoda Calanidae Calanus finmarchicus MIN 1.6 0.50 0.0017 8 0.000344 ?80 Conover 1960 I 37. Copepoda Calanidae Calanus finmarchicus 3.6 1.06 0.00094 7.5 0.000188 ?80 Conover 1960 I 38. Copepoda Calanidae Calanus finmarchicus 7 1.25 0.0015 0.1 0.000387 0.0763 73.5 Ikeda & Skjoldal 1989 I 39. Copepoda Calanidae Calanus glacialis MIN 7.8 1.73 0.002 3.5 0.000410 0.1121 79.7 Ikeda & Skjoldal 1989 I 40. Copepoda Calanidae Calanus glacialis 7.83 1.34 0.0024 -0.5 0.000662 0.0969 76.6 Ikeda & Skjoldal 1989 I 41. Copepoda Calanidae Calanus helgolandicus MIN 7.8180 3.909 0.000415 15 0.000086 83 Nival et al. 1972 I 42. Copepoda Calanidae Calanus helgolandicus 12.6912 4.487 0.000595 10 0.000119 80 Nival et al. 1972 I 43. Copepoda Calanidae Calanus hyperboreus MIN 1.05 0.37 0.013 10 0.00368 ?71 Conover 1960 I 44. Copepoda Calanidae Calanus hyperboreus 1.36 0.48 0.012 10 0.00362 ?71 Conover 1960 I 45. Copepoda Calanidae Calanus hyperboreus 2.23 0.79 10 0.00155 ?71 Conover 1960 I 46. Copepoda Calanidae Calanus hyperboreus 3.7 0.67 0.012 1.3 0.00395 0.0715 68 Ikeda & Skjoldal 1989 I 47. Copepoda Calanidae Calanus hyperboreus 3.72 0.70 0.0081 0.9 0.00194 0.0737 76.1 Ikeda & Skjoldal 1989 I 48.